Humidifier



FIG. 1 is a perspective view of a humidifier according to our design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof; and,

FIG. 4 is a right side view thereof.

The broken lines are included for the purpose of illustrating environmental structure of the humidifier that forms no part of the claimed design. 

The ornamental design of a humidifier, as shown and described. 